That's not the case with the Watts Up meter. The side you put the battery on depends on the situation, and which way the current is flowing. IE: FROM the battery and TO the motor, or FROM the charger and TO the battery. I had to make some Male/Male and Female/Female connectors also, for when I want to monitor charging.
ORIGINAL: ChopperMike
I don't know how the MPI meter is but on the Astroflight 101 meter, the battery always connects to the same of the meter regardless of whether you're reading charge or discharge current.
Mike